695. Max Area of Island

class Solution {
    public int maxAreaOfIsland(int[][] grid) {
        int maxArea = 0;
        for (int i = 0; i < grid.length; i++) {
            for (int j = 0; j < grid[0].length; j++) {
                if (grid[i][j] == 1) {
                    int[] curMaxArea = new int[]{0};
                    maxAreaOfIslandHelper(i, j, grid, curMaxArea);
                    maxArea = Math.max(maxArea, curMaxArea[0]);
                }
            }
        }
        return maxArea;
    }
    
    private void maxAreaOfIslandHelper(int i, int j, int[][] grid, int[] maxArea) {
        if (i < 0 || j < 0 || i > grid.length - 1 || j > grid[0].length - 1 || grid[i][j] == 0) {
            return;
        }
        grid[i][j] = 0;
        maxArea[0] += 1;
        int[][] dirs = {`{-1, 0}, {1, 0}, {0, -1}, {0, 1}`};
        for (int[] dir : dirs) {
            maxAreaOfIslandHelper(i + dir[0], j + dir[1], grid, maxArea);
        }
    }
}